Oracle Solution for Error ora-16431

ORA-16431: Cannot expand control file

What triggered the Error:

More threads were added on the primary database after this standby control file was created.

What should we do to fix it:

Shut down the standby database, either replace the control file with a new standby control file from primary database or change the COMPATIBLE parameter to 10.2.0 or above, and restart the standby database.